If you want to use Fraps u gotta have - 800x600 resolution..
- lag free PC (fast, with lots of powaa)
- have Fraps set on 100 FPS that's kinda the best..
and also turn off the things you don't need the most.. I on'y have bullet trajectories and shadows coz it helps to kill a lot.. otherwise it would lag..
or the 2nd best thing is to record with xfire.